Eurasian Journal of Veterinary Sciences
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1 Eurasian Journal of Veterinary Sciences RESEARCH ARTICLE The prevalence and pathology of ovine coccidiosis in Kerman, Iran Reza Kheirandish 1*, Saeid R Nourollahi-Fard 1, Elham Eslah 2 Özet Kheirandish R, Nourollahi-Fard SR, Eslah E. İran ın Kerman bölgesi koyun koksidiyozisinin patoloji ve prevalansı. Eurasian J Vet Sci, 2012, 28, 4, Amaç: Araştırma amacı güneydoğu İran ın Kerman bölgesi koyunlarında Eimeria enfeksiyonun varlığını araştırmaktır. Gereç ve Yöntem: Toplam 227 koyundan doğrudan dışkı örnekleri alındı. Dışkı örneklerinde ookist varlığı flotasyon tekniği ile araştırıldı. Her bir gram dışkıda ookist varlığı ve Eimeria türleri tanımlandı. Bulgular: Yedi farklı Eimeria (E. crandallis, E. ovina, E. parva, E. ovinoidalis, E. faurei, E. ahsata ve E. intricata) türü identifiye edildi. Koksidiyozun prevalansında koyunların yaş ve cinsiyetinin önemli olmadığı (p>0.05) belirlendi. Conclusion: Koyunlarda Eimeria enfeksiyonun varlığı belirlendi ve antikoksidial uygulamalar önerilebilir. Abstract Kheirandish R, Nourollahi-Fard SR, Eslah E. The prevalence and pathology of ovine coccidiosis in Kerman, Iran. Eurasian J Vet Sci, 2012, 28, 4, Aim: This study was undertaken to determine Eimeria infection in sheep in Kerman province. Material and Methods: ly 227 faecal were collected directly from the rectum of sheep. Faecal were analyzed using floatation technique for the presence of coccidian oocysts. Oocysts per gram of feces and Eimeria species were identified. Results: Seven species of Eimeria (E. crandallis, E. ovina, E. parva, E. ovinoidalis, E. faurei, E. ahsata and E. intricata) were identified. The age and sex of the sheep had no significant (p>0.05) effects on prevalence of coccidiosis. Conclusion: Eimeria infection was prevalent in sheep and anticoccidial treatments should be recommended. 1 Department of Pathobiology, 2 Graduated Student, Veterinary School of Shahid-Bahonar University of Kerman, Iran Received: , Accepted: Anahtar kelimeler: Prevalans, koksidiyoz, koyun Keywords: Prevalence, coccidiosis, sheep *kheirandish@uk.ac.ir
2 Introduction Coccidiosis is an economically important disease which is caused by obligate intracellular protozoa, Eimeria; with a worldwide distribution (Bastiani et al 2012, Chartier and Paraud 2012). It seems to be a serious threat to animal health and results in economic impact on the animal husbandry due to high morbidity, mortality and costs of treatment (Zachary and McGavin 2011, Bastiani et al 2012). 15 Eimeria species considered to have the capability of infecting sheep are E. ahsata, E. bakuensis, E. crandallis, E. faurei, E.granulosa, E. gonzalezi, E. gilruthi, E. intricata, E. marsica, E. ovinoidalis, E. pallida, E. parva, E. weybridgensis, E.punctata and E. gilruthi (Silva et al 2008). 14 species infect the sheep intestine and in one species (E. gilruthi) the abomasums is target tissue (Kaya 2004). E. ovinoidalis, E.bakuensis and E. ahsata are the most pathogenic species in small ruminants. All ages of sheep are susceptible to Eimeria infection but lambs are the most severely affected by clinical coccidiosis and disease outbreaks (Khan et al 2011). Some conditions such as poor hygienic situations, cold and wet weather, dietary changes, prolonged travel and overcrowded conditions may result in the development of higher level of infection (Chartier and Paraud 2012, Tylor 2012). Coccidia (Eimeria spp.) infection is common in sheep in Iran, but a few data are available about responsible Eimeria species and their prevalent of intensity (Yakhchali and Zarei 2008). Furthermore, the aims of were to determine the prevalence of coccidiosis and effect of age and sex parameters on frequency of disease and variation of Eimeria species in different age groups of sheep and pathology of coccidiosis in sheep. To present date, this is the first investigation on prevalence of different Eimeria species in affected sheep of Kerman province, the southeast part of Iran. Materials and Methods Sample collection 195 A total of 227 faecal (58 males, 169 females) were collected directly from the rectum of sheep, in a period of one year ( ) and stored at 4 0 C until examination. Sheep were selected randomly from the slaughtered animals in Kerman slaughterhouse and divided to 4 different age groups; less than 12 months, 1-2 years old, 2-3 years old and over 3 years old. Parasitological examination Faecal (3-5 g) were analyzed using floatation technique with saturated sucrose for the presence or absence of coccidian oocysts. Quantitative fecal examination was performed by McMaster technique to determine the number of oocysts per gram of feces (OPG). Eimeria species were identified following sporulation of faeces in a thin layer of 2.5% potassium dichromate for one or two weeks at 27 0 C. Identification of Eimeria species was based on the morphological features of the oocysts (size, shape, color, presence or absence of micropyle and its cap). Pathologic examination For pathological study, appropriate tissue were taken from the distal duodenum, jejunum, ileum, ileocecal valve, distal cecum, colon and rectum. All were fixed in 10% neutral buffered formalin, embedded in paraffin, sectioned at 5 μm thicknesses, and stained with hematoxylin-eosin (H&E) for light microscopic examination. Statistical analysis Data were analyzed using a Chi-square test and a p- value less than 0.05 value of p<0.05 was considered as significant (SPSS 11.5, Inc., Chicago). Results The oocysts of Eimeria spp. were found in 197 of the 227 sheep (86.79%). 128 out of 197 infected sheep (56.38%) had mixed infections with at least two species. Seven species of Eimeria (E. crandallis, E. ovina, E. parva, E. ovinoidalis, E. faurei, E. ahsata and E. intricata) were identified (Figure 1). The sex and age of the sheep had no significant (p>0.05) effect on prevalence of disease. There was no significant difference in OPG during four seasons (Table 1, 2). At necropsy, gross lesions were seen mostly in the je- Table 1. Prevalence of coccidial infection (OPG) in different ages and seasons in sheep. Season < 1 year (%) 1-2 year 2-3 year (%) (%) >3 year (%) Spring 8 8 (100%) (100%) 7 6 (85.7%) (91.4%) Summer (95%) (90.9%) (73.3%) 2 2 (100%) Autumn 9 9 (100%) 6 6 (100%) 7 7 (100%) 4 4 (100%) Winter (93.3%) (68.9%) (88.8%) (69.5%) (96.2%) (82.6%) (85.7%) (84.4%)
3 Table 2. Intensity of coccidial infection in different ages and seasons in sheep. Season < 1 year 1-2 year 2-3 year >3 year Spring Summer Autumn Winter junum, ileum and sometimes in cecum. Observed findings were including multifocal mucosal thickening of the jejunum, ileum, and lesser the cecum and proximal colon with scattered small white or grey plaques (Figure 2). These foci were nodular form, non-pedunculated in 3 mm to 1 cm diameter that were raised into the intestinal lumen, and sometime were visible from the serosal surface of intestine especially in the cases with larger nodules. In histopathological examination, the affected tissues revealed proliferative enteritis in varied degrees from mild to severe in different cases (Figure 3). In severe cases, multiple discrete, raised polypoid nodules were present in the mucosal surface. These nodules were characterized by remarkable papillary hyperplasia of the epithelium of crypts and villi. Inflammatory cells including lymphocytes, plasma cells, macrophages, and eosinophils were infiltrated in the lamina propria. Mucosa adjacent to polypoid nodules showed no histopathological changes. Numerous intracellular developmental stages of Eimeria including trophozoites, schizonts, microgamonts, macrogametes and oocysts were seen in the epithelium of the affected Lieberkuhn glands, Figure 1. Prevalence of Eimeria spp. exhibited by oocysts in sheep. villi and crypts (Figure 4-7). Immature forms of developmental stages were not easily identifiable. Discussion Coccidial infection in sheep and goats is a porotozoan parasitic worldwide disease. On the whole, 15 species of Eimeria have been identified in sheep. The prevalence rate and infective species of Eimeria is different in various geographical situations in according to the climate, temperature and amount of rain in different seasons, age, immune system of host, unhygienic conditions and rearing systems (Balicka 1999). In current investigation, the prevalence of coccidiosis was obtained 86.79% in sheep. Seven Eimeria species of including E. crandallis, E. ovina, E. parva, E. ovinoidalis, E. faurei, E. ahsata and E. intricata were diagnosed in affected animals (Figure 1). In previous studies in Figure 2. Ileum. Multiple nonpedunculated polyp like lesions. Figure 3. Ileum. Proliferative enteritis. HE. Bar=250µm. Figure 4. Trophozoites with a round nucleus are located within a parasitophorous vacuoles (arrows) in the cytoplasm of epithelial cell (H&E, Bar=10 µm). Figure 5. Developmental stages of Eimeria. Figure 6. Macrogametes are characterized by Schizont with numerous crescent-shaped merozoite (arrow) and several macrogametes with plastic granules (H&E, Bar=10 µm). a central nucleus and peripheral eosinophilic peripheral eosinophilic plastic granules are seen (H&E, Bar=25 µm). Figure 7. Developmental stages of Eimeria. Macrogametes with peripheral eosinophilic plastic granules (arrows) and microgamont with basophilic nuclei (arrowhead) are seen (H&E, Bar=25 µm).
4 197 Iran, Yakhchali and Zarei (2008) recognized 6 Eimeria species (E. intricate, E. ovina, E. faurei, E. parva, E. ahsata, E. pallida) in sheep of Tabriz province. Also, in other report from Sanandaj, Iran, Yakhchali and Gholami (2008) studied coccidiosis in sheep and detected 6 Eimeria species (E. ovinoidales, E. faurei, E. ahsata, E. parva, E. ovina, E. intricata). In Saudi Arabia, Toulah et al (2007) reported 41% infection with coccidiosis in affected sheep and identified 4 Eimeria species (E. parva, E. intricate, E. arloingi, E. ovina). In a study in Turkey by Kaya (2004), E. crandallis reported as predominant infective species in lambs. In Iceland, reported species of coccidian were E. ahsata, E. bakuensis, E. crandallis, E. faurei, E. granulosa, E. intricate, E. ovinoidales, E. pallida, E. parva and E. weybridgensis (Reginsson and Richter 1997, Skirnisson 2007). In study of Reginsson and Richter (1997), E. crandallis and E. ovonoidalis were the most predominant in on one-month-old lambs. Similar to the present study (Figure 1), E. crandallis was the most commonly species in affected sheep. In South Africa, 6 Eimeria species (E. crandallis, E. bakuensis, E. weybridgensis, E. ahsata, E. intricate, E. ovinoidalis) were recovered from the sheep by Bakunzi et al (2010) that the most frequently occurring species in sheep were E. crandallis and E. bakuensis. In agreement with our report, the common pathogenic Eimeria species was E. crandallis. In Brazil, E. ovina, E. ahsata, E. crandallis, E. faurei, E. intrincata, E. ovinoidalis, E. pallid, E. parva and E. granulose were reported in sheep (Andrade Junior et al 2012). In Germany, Dittmar et al (2010) identified 12 Eimeria species (E. ahsata, E. bakuensis, E. crandallis, E. faurei, E. granulosa, E. intricata, E. marsica, E. ovinoidalis, E. pallida, E. parva, E. punctuate, E. weybridgensis). They stated coccidiosis increased non-significantly with the age of sheep. In the current study, mixed infection with three or four Eimeria species was more commonly seen than infection with a single Eimeria species, similar to findings of other researchers (Toulah 2007, Yakhchali and Gholami 2008, Yakhchali and Zarei 2008, Wang et al 2010). A study conducted in southern Brazil revealed that 59 % of faecal from sheep were positive for the genus Eimeria (Silva et al 2008). In the present study, histopathologic findings of coccidiosis including papillary hyperplasia of intestinal villi and presence of different coccidial stages in epithelial were similar to previous surveys (Brown et al 2007, Khodakaram Tafti and Mansourian 2008, Zachary and McGavin 2011). Conclusions The present survey revealed a high significant prevalence of coccidial infection in sheep and necessity to carry out control programs. Further studies should be performed to reveal more information about the economic effects of this parasite which would be useful for establishing control and management programs. Acknowledgements This research was financially supported by the research council of Shahid Bahonar University of Kerman, Iran. We wish to thank Mr. Hasanzadeh for their technical assistance. References Andrade Junior ALF, Silva PC, Aguiar EM, Araujo Santos FG, Use of coccidiostat in mineral salt and study on ovine eimeriosis. Rev Bras Parasitol Vet Jaboticabal, 21, Bakunzi FR, Thwane SN, Motsei LE, Dzoma BM, Diversity and seasonal occurrence of Eimeria species in a mixed flock of communally reared sheep and goats in Mafikeng in the NorthWest Province, South Africa. J S Afr Vet Assoc, 81, Balicka-Ramisz A, Studies on coccidiosis in goats in Poland. Vet Parasitol, 81, Bastiani FT, Silva AS, Duck MRK, Tonin AA, Monteiro SG, Outbreak of eimeriosis and giardiasis associated to mortality of lambs in southern Brazil. Comp Clin Pathol, DOI /s Brown CC, Baker DC, Barker IK, The alimentary system. In: Jubb MMG (Ed.), Kennedy and Palmer s Pathology of Domestic Animals, 5th edition, Saunders Elsevier, UK, pp: Chartier C, Paraud C, Coccidiosis due to Eimeria in sheep and goats, a review. Small Ruminant Res, 103, Dittmar K, Mundt HC, Grzonka E, Daugschies A, Bangoura B, Ovine coccidiosis in housed lambs in Saxony- Anhalt (Central Germany). Berl Munch Tierarztl, 123, Kaya G, Prevalence of Eimeria species in lambs in Antakya province. Turk J Vet Anim Sci, 28, Khan MN, Rehman T, Iqbal Z, Sajid MS, Ahmad M, Riaz M, Prevalence and associated risk factors of Eimeria in sheep of Punjab, Pakistan. WASET, 79, Khodakaram Tafti A, Mansourian M, Pathologic lesions of naturally occurring coccidiosis in sheep and goats. Comp Clin Pathol 17, Maingi N, Munyua WK, The prevalence and intensity of infection with Eimeria species in sheep in Nyandarua district of Kenya. Vet Res Commun, 18, Ozdal N, Tanritanir P, Goz Y, Deger S, Kozat S, Parasitic protozoans (Eimeria, Giardia and Cryptosporidium) in lambs with diarrhea in the Van province (Turkey). Bull Vet Inst Pulawy, 5, Reginsson K, Richter SH, Coccidia of the genus Eimeria in sheep in Iceland. Icel Agr Sci, 11, Silva FRC, Souza JD, Fialho CG, Escopeli KS, Araujo FAP, Identification of Eimeria species in sheep in Mostardas, southern Brazil. Veterinaria Em Foco, 6, Skirnisson K, Eimeria spp. (Coccidia, Protozoa) infections in a flock of sheep in Iceland: Species composition and seasonal abundance. Agric Sci, 20, Taylor MA, Emerging parasitic diseases of sheep. Vet Parasitol, 2012, (in press).
5 Toulah FH, Prevalence and comparative morphological study of four Eimeria spp. Sheep in Jeddah area, Saudi Arabia. J Biol Sci, 7, Wang CR, Xiao JY, Chen AH, Chen J, Wang Y, Gao JF, Zhu XQ, Prevalence of coccidial infection in sheep and goats in northeastern China. Vet Parasitol, 174, Yakhchali M, Golami E, Eimeria infection (Coccidia: Eimeriidae) in sheep of different age groups in Sanandaj 198 city, Iran. Vet Arhiv, 78, Yakhchali M, Zarei MR, Prevalence of Eimeria infection in sheep of Tabriz suburb, Iran. IJVR, 9, Zachary JF, McGavin MD, Pathologic basis of veterinary disease. 5th edition, Elsevier Mosby, London, UK, pp:
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